feat: Disable navigating with keys.

Although I think this is super convenient, it turns out that it is not
generally accessible.

See pydata/pydata-sphinx-theme#1492

`False` will be the default in the future but we explicitly set it now
to quiet a warning about the change.

shared/conf.py

@@ -78,6 +78,7 @@
     "use_repository_button": True,
     "use_issues_button": True,
     "use_edit_page_button": True,
+    "navigation_with_keys": False,
     # Please don't change unless you know what you're doing.
     "extra_footer": """
         <a rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/">